Final answer:
Endurance training leads to a decrease in lactate production and an increase in lactate clearance, which delays the onset of blood lactate accumulation (OBLA) during intense exercise.
Step-by-step explanation:
The question concerns the effects of endurance training on the onset of blood lactate accumulation (OBLA). Endurance training has several effects on the body’s ability to handle lactate during exercise. The correct answer to the effects of endurance training on OBLA is A. Decreased lactate production and increased lactate clearance.
During endurance training, the body adapts in several ways that can affect lactate levels. Firstly, there is a decrease in the rate of lactate production due to improved efficiency in aerobic metabolism. Secondly, the body increases its capacity to clear lactate from the muscles and blood, thanks to a rise in the number of mitochondria and enzymes like lactate dehydrogenase, which help in processing lactate more efficiently. These adaptations help delay the accumulation of lactate, allowing individuals to sustain exercise at a higher intensity for longer before reaching OBLA.